[crfpwr]

Can I run the stock cams with the 13.5:1 piston? Or do I have to run like a modified cam with that?

[Asmith]

Stock cam is fine.

[crfpwr]

cool, so i should go with the 13.5:1 then??? or will it affect the longevity of the over all bike?
i have an 05 and i dont want to stress the cam to much, it is still all stock...

[Asmith]

cool, so i should go with the 13.5:1 then??? or will it affect the longevity of the over all bike?
i have an 05 and i dont want to stress the cam to much, it is still all stock...

Going from 12.9 to 13.5 isn't that big of a jump.

The cam will not be stressed, it's the crank/rod that you have to be concerned with.

If the bike isn't really high hour, you should have no issues. If it's roached, look out!!!

[crfpwr]

Yeah, thats what I ment the crank not the cam... but the bike doesn't seem to have to many hours on it but I can't tell, I bought it used so I don't know.... The piston is not in to bad condition.. I'm going to pull the cylinder off to look at the cylinder walls and the rod and crank for excevive wear..